Return Character

Okay, here is what I am doing. I am currently able to save a string into a file. The problem is when I save a second string to the file the two strings are tight next to each other. I need them to be on seperate lines. So my questions is this, how do you either append the end of line signal to the first string. Or send the End of Line signal right afterwards.
I attempted to use the VK_RETURN function, but that is not working. There is a possibility I am implementing that function incorrectly. Okay, thanks for the help
Sincerely,
Ronald